| NOUN | body | musculus sphincter pupillae, pupillary sphincter | a ring of smooth muscle surrounding the iris |
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| Meaning | A ring of smooth muscle surrounding the iris. | |
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| Synonym | pupillary sphincter | |
| Part of | eye, oculus, optic | The organ of sight |
| Broader | sphincter, anatomical sphincter, sphincter muscle | A ring of muscle that contracts to close an opening |
| Catalan | esfínter de la nineta de l'ull, esfínter de la pupil·la | |
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